Invalid character in dns name letsencrypt

Mi dominio tiene un carácter especial el cual es un guion “-” y cuando ejecuto sudo certbot – nginx y luego escribo mi dominio genera error
alguien me puede ayudar?
gracias

My domain has a special character that is a “-” script and when I run sudo certbot - nginx and then write, my domain generates an error
Can someone help me?
Thank you

Please show the complete command and the complete error message.

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